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