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