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