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