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