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