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)(13,14,17,21,18,22,26,20)(15,19,23,28,16,24,25,27)(2,3)(5,6)(7,11)(8,10)(9,12)(13,15,18,16)(14,19,22,24)(17,23,26,25)(20,27,21,28)(5,7,8,12)(6,9,10,11)(14,20)(17,26)(19,27)(21,22)(23,25)(24,28)(1,3,4,2)(7,12)(9,11)(13,16,18,15)(14,19,22,24)(17,25,26,23)(20,27,21,28)(6,10)(9,11)(15,16)(19,24)(23,25)(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.