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