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