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