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