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