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