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