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