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