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