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