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