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