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