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