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