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