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