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