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