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