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