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