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