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