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