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