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