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