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