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