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