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