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)(19,27)(20,24)(21,25)(22,26)(23,29)(28,45)(30,43)(31,48)(32,40)(33,41)(34,42)(35,38)(36,44)(37,46)(39,47) involution — undirected(2,5)(6,8)(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)(10,13)(14,16)(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)(9,11,12,15)(10,14,13,16)(19,29)(23,27)(28,46)(30,35)(31,47)(37,45)(38,43)(39,48)(1,3,4,7)(2,6,5,8)(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.