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