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