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