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