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