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