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