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