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