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