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