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