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