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