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