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