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