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