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