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