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