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