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