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