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