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