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