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