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