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