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