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