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