One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(5,6)(7,10)(8,9)(11,12)(13,14)(15,20)(16,21)(17,22)(18,23)(19,24)(25,46)(26,39)(27,40)(28,41)(29,42)(30,43)(31,44)(32,45)(33,49)(34,48)(35,50)(36,51)(37,53)(38,54)(47,59)(52,61)(55,74)(56,71)(57,69)(58,70)(60,67)(62,68)(63,72)(64,73)(65,76)(66,75)(6,9)(10,12)(13,15,16,26)(14,20,21,39)(17,25,30,54)(18,36,31,64)(19,37,32,29)(22,46,43,38)(23,51,44,73)(24,53,45,42)(27,59,57,33)(28,61,58,34)(35,62,63,56)(40,47,69,49)(41,52,70,48)(50,68,72,71)(55,66,60,65)(67,76,74,75)(2,4)(5,7,8,11)(6,10,9,12)(14,21)(15,25)(17,33)(18,34)(19,32)(20,38)(22,47)(23,52)(26,54)(27,28)(29,62)(30,59)(31,61)(35,66)(36,55)(37,56)(39,46)(40,70)(41,69)(42,71)(43,49)(44,48)(50,76)(51,67)(53,68)(57,58)(60,64)(63,65)(72,75)(73,74)A 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.