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