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