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