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