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