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