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