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