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