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