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