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