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