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