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