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