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