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