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