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