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