One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,8,14)(3,15,18,9)(4,21,26,72)(5,11,28,47)(6,30,34,70)(7,35,32,13)(10,41,45,24)(12,49,51,33)(16,56,22,73)(17,53,61,38)(19,66,64,86)(20,40,65,55)(23,71,76,120)(25,78,36,50)(27,79,82,119)(29,84,81,48)(31,52,88,44)(37,58,42,74)(39,68,54,103)(43,96,97,75)(46,99,101,83)(57,107,60,110)(59,94,69,104)(62,115,113,122)(63,93,114,106)(67,90,87,95)(77,121,85,100)(80,102,123,98)(89,108,91,111)(92,117,105,128)(109,127,112,126)(116,125,118,124)(1,3,7,20,8,18,32,65)(2,9,13,40,14,15,35,55)(4,22,25,69,26,16,36,59)(5,17,29,63,28,61,81,114)(6,19,33,68,34,64,49,103)(10,42,44,95,45,37,52,90)(11,38,48,93,47,53,84,106)(12,39,30,86,51,54,70,66)(21,56,50,104,72,73,78,94)(23,60,77,112,76,57,85,109)(24,74,31,87,41,58,88,67)(27,62,83,117,82,113,99,128)(43,91,98,125,97,89,102,124)(46,92,79,122,101,105,119,115)(71,107,100,126,120,110,121,127)(75,111,80,116,96,108,123,118)(1,4,8,26)(2,10,14,45)(3,16,18,22)(5,23,28,76)(6,31,34,88)(7,36,32,25)(9,37,15,42)(11,43,47,97)(12,50,51,78)(13,52,35,44)(17,60,61,57)(19,67,64,87)(20,69,65,59)(21,70,72,30)(24,49,41,33)(27,80,82,123)(29,85,81,77)(38,91,53,89)(39,94,54,104)(40,95,55,90)(46,100,101,121)(48,102,84,98)(56,86,73,66)(58,103,74,68)(62,116,113,118)(63,109,114,112)(71,119,120,79)(75,99,96,83)(92,126,105,127)(93,124,106,125)(107,115,110,122)(108,117,111,128)(1,5)(2,11)(3,17)(4,23)(6,27)(7,29)(8,28)(9,38)(10,43)(12,46)(13,48)(14,47)(15,53)(16,57)(18,61)(19,62)(20,63)(21,71)(22,60)(24,75)(25,77)(26,76)(30,79)(31,80)(32,81)(33,83)(34,82)(35,84)(36,85)(37,89)(39,92)(40,93)(41,96)(42,91)(44,98)(45,97)(49,99)(50,100)(51,101)(52,102)(54,105)(55,106)(56,107)(58,108)(59,109)(64,113)(65,114)(66,115)(67,118)(68,117)(69,112)(70,119)(72,120)(73,110)(74,111)(78,121)(86,122)(87,116)(88,123)(90,124)(94,127)(95,125)(103,128)(104,126) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.