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