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