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