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