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