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