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