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