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