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