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