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