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