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