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