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