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