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