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