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