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