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