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