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