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