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