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