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