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