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