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