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