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