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