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