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