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