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