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