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