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)(11,12)(13,17)(14,16)(15,19)(18,20)(21,23)(22,24)(25,26,31,32)(27,33,28,29)(30,34,39,40)(35,38,36,37)(2,3)(6,7)(9,11)(10,15)(12,16)(13,18)(14,19)(17,23)(20,24)(21,22)(26,32)(29,33)(34,40)(37,38) involution — undirected(1,3,5,2)(4,7,8,6)(10,16)(12,15)(17,24)(20,23)(25,27,31,28)(26,33,32,29)(30,35,39,36)(34,38,40,37)(1,4,5,8)(2,6,3,7)(9,12,14,15)(10,11,16,19)(13,20,22,23)(17,18,24,21)(25,28,31,27)(26,29,32,33)(30,36,39,35)(34,37,40,38)(9,13,14,22)(10,17,16,24)(11,18,19,21)(12,20,15,23)(25,29)(26,27)(28,32)(30,38)(31,33)(34,36)(35,40)(37,39)(9,11)(10,15)(12,16)(13,21)(14,19)(17,20)(18,22)(23,24)(25,30)(26,34)(27,35)(28,36)(29,37)(31,39)(32,40)(33,38) 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.