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