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