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