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