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