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)(19,30)(20,34)(21,36)(22,38)(23,29)(24,27)(25,33)(26,31)(28,40)(32,42)(35,43)(37,44)(39,45)(41,48)(46,47) involution — undirected(2,5)(3,7)(17,19,23,33)(18,25,29,30)(20,21,31,24)(22,35,40,39)(26,36,34,27)(28,43,38,45)(32,41,47,37)(42,44,46,48)(10,13)(14,16)(17,20,24,19,23,31,21,33)(18,26,27,25,29,34,36,30)(22,39,41,47,40,35,37,32)(28,45,44,46,38,43,48,42)(2,5)(6,8)(9,11,12,15)(10,14,13,16)(17,21,23,24)(18,27,29,36)(19,31,33,20)(22,37,40,41)(25,26,30,34)(28,44,38,48)(32,39,47,35)(42,43,46,45)(1,3,4,7)(2,6,5,8)(17,22,24,41,23,40,21,37)(18,28,27,44,29,38,36,48)(19,32,31,39,33,47,20,35)(25,42,34,45,30,46,26,43)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.