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