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