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