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