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