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