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