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