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