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