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