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