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