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