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