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