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