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