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