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