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