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