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