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