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