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