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