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