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