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