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