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