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