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