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