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