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