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