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