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