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