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