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