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