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