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