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