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