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