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