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