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