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