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