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