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