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)(19,24)(20,21)(22,23)(25,26)(27,35)(28,31)(29,33)(30,38)(32,36)(34,39)(37,40)(2,3)(6,7)(9,11)(10,13)(12,20)(14,18)(15,17)(16,24)(19,22)(21,23)(25,27,31,36)(26,32,28,35)(29,39,40,30)(33,38,37,34)(1,3,5,2)(4,7,8,6)(10,15)(11,18)(16,23)(19,20)(26,28)(32,35)(33,37)(34,38)(1,4,5,8)(2,6,3,7)(9,11)(10,13)(12,19)(14,18)(15,17)(16,21)(20,22)(23,24)(25,28,31,26)(27,32,36,35)(29,33,40,37)(30,38,39,34)(9,12,14,22)(10,16,15,23)(11,19,18,20)(13,21,17,24)(25,29,31,40)(26,33,28,37)(27,30,36,39)(32,34,35,38)(9,13)(10,11)(12,21)(14,17)(15,18)(16,19)(20,23)(22,24)(25,30)(26,34)(27,29)(28,38)(31,39)(32,33)(35,37)(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.