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