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