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