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