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