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