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