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