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