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