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