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