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