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