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