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