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