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