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