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