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