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