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