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