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