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