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