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