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