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