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