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