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