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