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)(19,26)(20,33)(21,27)(22,28)(23,38)(24,29)(25,31)(30,40)(32,41)(34,47)(35,42)(36,44)(37,43)(39,45)(46,48) involution — undirected(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,19,23,31,24,32,22,20)(18,25,28,26,29,33,38,41)(21,30,35,45,36,46,37,34)(27,39,43,40,44,47,42,48)(1,3,4,7)(2,6,5,8)(10,13)(11,15)(17,20,22,32,24,31,23,19)(18,26,38,25,29,41,28,33)(21,34,37,46,36,45,35,30)(27,40,42,39,44,48,43,47)(9,11,12,15)(10,14,13,16)(17,21)(18,27)(19,30)(20,34)(22,37)(23,35)(24,36)(25,39)(26,40)(28,43)(29,44)(31,45)(32,46)(33,47)(38,42)(41,48)(10,13)(14,16)(17,22,24,23)(18,28,29,38)(19,20,32,31)(21,35,36,37)(25,26,33,41)(27,42,44,43)(30,45,46,34)(39,48,47,40)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.