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