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