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