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