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