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