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