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