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