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