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