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