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)(17,18,22,24)(19,23,25,32)(20,21,29,31)(26,27,28,30)(33,34,38,39)(35,41,43,36)(37,45,46,40)(42,44,48,47)(2,6)(7,9)(8,13)(14,15)(17,19)(18,23)(20,28)(21,30)(22,25)(24,32)(26,29)(27,31)(34,39)(36,41)(37,46)(42,48) involution — undirected(3,10)(4,12)(7,9)(8,13)(18,24)(19,25)(20,29)(27,30)(33,35,38,43)(34,36,39,41)(37,42,46,48)(40,44,45,47)(1,3,5,10)(2,7,6,9)(4,11,12,16)(8,14,13,15)(17,19)(18,23)(20,26)(21,27)(22,25)(24,32)(28,29)(30,31)(33,35)(34,36)(37,42)(38,43)(39,41)(40,44)(45,47)(46,48)(1,4)(2,8)(3,11)(5,12)(6,13)(7,14)(9,15)(10,16)(17,20)(18,21)(19,26)(22,29)(23,27)(24,31)(25,28)(30,32)(33,36)(34,35)(37,44)(38,41)(39,43)(40,42)(45,48)(46,47) involution — undirected(1,2)(3,7)(4,8)(5,6)(9,10)(11,14)(12,13)(15,16)(17,21)(18,20)(19,27)(22,31)(23,26)(24,29)(25,30)(28,32)(33,37,38,46)(34,40,39,45)(35,42,43,48)(36,44,41,47)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.