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