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