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