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