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