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