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