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