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