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