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