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