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