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