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)(11,13)(12,14)(15,16)(17,18,21,26,22,24,34,38)(19,27,29,35,30,40,33,23)(20,25,32,39,31,37,44,47)(28,41,43,46,42,48,45,36)(9,11)(10,13)(12,15)(14,16)(17,19,22,30)(18,23,24,35)(20,28,31,42)(21,33,34,29)(25,36,37,46)(26,40,38,27)(32,45,44,43)(39,48,47,41)(2,5)(6,8)(11,15)(13,16)(18,24)(20,31)(23,35)(26,38)(27,40)(28,42)(32,44)(43,45) involution — undirected(11,15)(13,16)(17,20,22,31)(18,25,24,37)(19,28,30,42)(21,32,34,44)(23,36,35,46)(26,39,38,47)(27,41,40,48)(29,43,33,45)(1,3,4,7)(2,6,5,8)(10,14)(13,16)(20,31)(25,37)(28,42)(32,44)(36,46)(39,47)(41,48)(43,45)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.