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