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