One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,7)(6,8)(9,10)(11,15)(12,14)(13,16)(17,18)(19,28)(20,33)(21,37)(22,25)(23,27)(24,32)(26,36)(29,39)(30,40)(31,41)(34,42)(35,43)(38,44)(45,48)(46,47) involution — undirected(1,3)(2,6)(4,7)(5,8)(17,19,22,32)(18,24,25,28)(20,34,36,30)(21,31,23,29)(26,42,33,40)(27,41,37,39)(35,46,38,45)(43,48,44,47)(9,11,12,16)(10,13,14,15)(18,25)(19,29)(21,23)(24,39)(26,33)(28,41)(30,45)(31,32)(34,46)(35,38)(40,47)(42,48)(2,7)(3,8)(10,14)(13,15)(17,20,22,36)(18,26,25,33)(19,30,32,34)(21,38,23,35)(24,40,28,42)(27,44,37,43)(29,45,31,46)(39,47,41,48)(1,4,5,6)(2,3,7,8)(17,21,22,23)(18,27,25,37)(19,31,32,29)(20,35,36,38)(24,41,28,39)(26,43,33,44)(30,45,34,46)(40,47,42,48)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.