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