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