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