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