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