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