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