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