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