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