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