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)(11,13)(12,14)(15,16)(17,18)(19,25)(20,30)(21,27)(22,24)(23,26)(28,31)(29,32) involution — undirected(1,3,5,4)(2,6,8,7)(9,11,12,15)(10,13,14,16)(18,24)(19,28)(20,23)(21,25)(27,29)(31,32)(1,3,5,4)(2,7,8,6)(10,14)(13,16)(17,19)(18,25)(20,28)(21,26)(22,29)(23,27)(24,32)(30,31)(1,3,5,4)(2,7,8,6)(17,20)(18,26)(19,29)(21,31)(22,23)(24,30)(1,4,5,3)(2,6,8,7)(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.