One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,13,40,66,102,62,8,15,37,12,45,61,83,73,9,16,42,63,35,60,36,93,18,70,5,32,7,14,41,67)(3,17,21,50,43,64,33,10,23,49,20,68,86,104,105,51,24,76,87,118,85,120,106,52,46,109,88,75,22,58,38,71)(4,25,28,95,44,108,34,57,30,97,26,94,99,59,107,72,31,53,100,55,98,65,103,11,47,54,27,69,29,96,39,56)(19,48,79,112,90,117,101,74,81,114,78,110,124,122,126,121,82,115,125,127,123,128,84,92,91,119,77,111,80,113,89,116)(1,3,18,23,9,24,8,46)(2,10,15,71,16,52,70,51)(4,19,30,91,31,82,47,81)(5,33,42,105,37,106,6,38)(7,43,35,86,45,85,40,22)(11,48,72,114,57,115,56,119)(12,58,63,120,32,104,13,64)(14,68,66,50,61,75,60,118)(17,73,109,93,76,67,49,62)(20,83,87,102,88,41,21,36)(25,92,54,116,53,74,97,121)(26,84,100,126,27,101,28,89)(29,90,44,80,99,123,98,124)(34,77,107,125,103,78,39,79)(55,117,94,122,95,128,69,113)(59,110,108,127,96,111,65,112)(1,4)(2,11)(3,19)(5,34)(6,39)(7,44)(8,47)(9,31)(10,48)(12,59)(13,65)(14,69)(15,72)(16,57)(17,74)(18,30)(20,84)(21,89)(22,90)(23,91)(24,82)(25,93)(26,36)(27,102)(28,41)(29,40)(32,96)(33,77)(35,99)(37,103)(38,79)(42,107)(43,80)(45,98)(46,81)(49,116)(50,117)(51,119)(52,115)(53,62)(54,67)(55,66)(56,70)(58,110)(60,95)(61,94)(63,108)(64,112)(68,113)(71,114)(73,97)(75,122)(76,92)(78,106)(83,100)(85,124)(86,123)(87,126)(88,101)(104,111)(105,125)(109,121)(118,128)(120,127) 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.