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