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