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