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