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