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