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