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