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