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