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