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