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