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