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