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