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