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