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