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