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