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