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