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