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