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