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)(19,24)(20,25)(21,27)(22,28)(23,26)(29,37)(30,39)(31,38)(32,40)(33,42)(34,43)(35,41)(36,44)(45,47)(46,48)(2,5)(3,7)(9,11)(10,13)(12,15)(14,16)(17,19,22,30,23,31,21,36)(18,24,28,39,26,38,27,44)(20,32,34,45,35,46,33,29)(25,40,43,47,41,48,42,37)(3,7)(6,8)(10,14)(13,16)(17,20,21,33,23,35,22,34)(18,25,27,42,26,41,28,43)(19,29,30,32,31,45,36,46)(24,37,39,40,38,47,44,48)(1,3,4,7)(2,6,5,8)(11,15)(13,16)(18,26)(24,38)(25,41)(27,28)(37,47)(39,44)(40,48)(42,43)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.