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