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