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)(11,16)(12,22)(13,23)(14,17)(15,19)(18,20)(21,24)(25,26)(27,37)(28,33)(29,34)(30,35)(31,36)(32,39)(38,40)(1,3,5,8)(2,6,4,7)(9,11,15,21)(10,16,19,24)(12,20,14,13)(17,23,22,18)(25,27,31,39)(26,32,36,37)(28,35,34,38)(29,30,33,40)(1,2,5,4)(3,6,8,7)(9,12,15,14)(10,17,19,22)(11,20,21,13)(16,23,24,18)(25,28,31,34)(26,33,36,29)(27,38,39,35)(30,37,40,32)(1,4,5,2)(3,7,8,6)(9,13)(10,18)(11,12)(14,21)(15,20)(16,17)(19,23)(22,24)(25,29,31,33)(26,34,36,28)(27,30,39,40)(32,38,37,35)(9,14,15,12)(10,17,19,22)(11,13,21,20)(16,23,24,18)(25,26)(27,32)(28,33)(29,34)(30,38)(31,36)(35,40)(37,39)(9,10)(11,16)(12,17)(13,18)(14,22)(15,19)(20,23)(21,24)(25,30)(26,35)(27,33)(28,37)(29,39)(31,40)(32,34)(36,38) 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.