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