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